66228061 has 2 divisors, whose sum is σ = 66228062. Its totient is φ = 66228060.

The previous prime is 66228037. The next prime is 66228067. The reversal of 66228061 is 16082266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58905625 + 7322436 = 7675^2 + 2706^2 .

It is a cyclic number.

It is not a de Polignac number, because 66228061 - 2⁷ = 66227933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66228067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33114030 + 33114031.

It is an arithmetic number, because the mean of its divisors is an integer number (33114031).

Almost surely, 2^66228061 is an apocalyptic number.

It is an amenable number.

66228061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66228061 is an equidigital number, since it uses as much as digits as its factorization.

66228061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 66228061 is about 8138.0624844001. The cubic root of 66228061 is about 404.5889463534.

The spelling of 66228061 in words is "sixty-six million, two hundred twenty-eight thousand, sixty-one".